Geometry of rare regions behind Griffiths singularities in random quantum magnets

In many-body systems with quenched disorder, dynamical observables can be singular not only at the critical point, but in an extended region of the paramagnetic phase as well. These Griffiths singularities are due to rare regions, which are locally in the ordered phase and contribute to a large susceptibility. Here, we study the geometrical properties of rare regions in the transverse Ising model with dilution or with random couplings and transverse fields. In diluted models, the rare regions are percolation clusters, while in random models the ground state consists of a set of spin clusters, which are calculated by the strong disorder renormalization method. We consider the so called energy cluster, which has the smallest excitation energy and calculate its mass and linear extension in one-, two-and three-dimensions. Both average quantities are found to grow logarithmically with the linear size of the sample. Consequently, the energy clusters are not compact: for the diluted model they are isotropic and tree-like, while for the random model they are quasi-one-dimensional.

Hybrid Forecasting Methodology for Wind Power-Photovoltaic-Concentrating Solar Power Generation Clustered Renewable Energy Systems

Forecasting of large-scale renewable energy clusters composed of wind power generation, photovoltaic and concentrating solar power (CSP) generation encounters complex uncertainties due to spatial scale dispersion and time scale random fluctuation. In response to this, a short-term forecasting method is proposed to improve the hybrid forecasting accuracy of multiple generation types in the same region. It is formed through training the long short-term memory (LSTM) network using spatial panel data. Historical power data and meteorological data for CSP plant, wind farm and photovoltaic (PV) plant are included in the dataset. Based on the data set, the correlation between these three types of power generation is proved by Pearson coefficient, and the feasibility of improving the forecasting ability through the hybrid renewable energy clusters is analyzed. Moreover, cases study indicates that the uncertainty of renewable energy cluster power tends to weaken due to partial controllability of CSP generation. Compared with the traditional prediction method, the hybrid prediction method has better prediction accuracy in the real case of renewable energy cluster in Northwest China.

A Model for Managing a Regional Coal and Energy Cluster on the Example of the Kemerovo Region — Kuzbass

The development of the region directly depends on the work of economic entities, especially if they belong to the basic industries of specialization. Kuzbass was remains industrial region. Therefore, for its development in modern conditions of an unstable and constantly changing environment, a high level of competitiveness of enterprises of the fuel and energy complex is required, to achieve which it is necessary to develop relevant directions for increasing the economic security of enterprises. One of these areas is the creation of the Kuzbass coal and energy cluster in the region. The effectiveness of the functioning of such a structure largely depends on competent management. In this paper, a model for managing a regional coal-energy cluster proposed using the example of the Kemerovo region - Kuzbass.

EUROPEAN EXPERIENCE OF FUNCTIONING OF CLUSTERS IN THE FIELD OF ENERGY EFFICIENCY AND RENEWABLE ENERGY: LESSONS OF INNOVATIVE DEVELOPMENT

In the modern world, attention to the use of renewable energy sources (RES) is increasing. This is primarily due to significant investments in the exploration and development of new oil and gas fields, the approaching threshold of exhaustion of these energy resources and, as a result, the end of the era of cheap oil. In addition, the use of these non-renewable energy sources is largely associated with an increase in carbon dioxide emissions into the atmosphere and an aggravation of environmental problems. According to the energy development strategy of the European Union, energy cluster projects are designed to form and develop ties between the countries. The European Union clusters focus on the following areas: energy, nutrition and health, marine and other industries. The energy cluster includes: wind energy, biomass energy, bioenergy conversion, offshore wind energy, innovative energy ecosystem. The energy cluster of the European Union unites energy companies, promoting the integration of science and technology, creating conditions for the development of competition and cooperation between enterprises in commercial activities. For many years, clusters have been the leading form of providing for regions in the world. And the field of renewable energy is no exception here. We emphasize that this area has It has a pronounced innovation orientation and is able to become a locomotive of innovative processes in Ukraine. Forming and developing clusters in the field of RES, the regions of Ukraine can significantly accelerate their own innovative development and modernize the regional economy. Therefore, the study of foreign experience in the functioning of such clusters is extremely relevant. The high capital intensity of innovative processes in the electric power industry, combined with the significant investment potential of domestic energy companies, make it possible to consider the industry as one of the largest customers for the creation of innovative technologies. The activation of these processes in the energy sector determines the need for systematic management of the joint development of energy enterprises and related industries and areas of activity. The implementation of this approach should be facilitated by the formation and development of energy clusters. The article examines the foreign experience of creating such innovative structures in the industry.

Energy cluster – an attempt in characterisation and definition

Clusters are an organisational and economic phenomenon. This paper attempts to answer what an energy cluster actually is and whether it meets the requirements of a cluster in the classical approach of economic sciences. The Act of 20 February 2015 on renewable energy sources (Ustawa OZE 2015) introduced the concept of an ‘energy cluster’. It was aimed at, among others, increasing energy security and environmental protection through an efficient use of renewable energy sources. In the literature on the subject, there is no single universally applicable definition of a cluster, it can only be considered in its various aspects. The concept of a cluster has so many applications, associations and meanings that in many respects it has become a ‘chaotic idea’ due to flattening and equalising different types, processes and spatial scales of economic location within one universal concept. However, the main doubt concerns the very definition of a cluster. The paper considers the organisational attributes of clusters, based on the analysis of the following aspects: a) Cluster in historical terms. Overview of cluster and network definitions: i. Overview of cluster definitions ii. Overview of network structure definitions b) Energy cluster. Forms of interorganisational relations and the typology of energy clusters i. Forms of interorganisational relations in an energy cluster ii. Energy cluster against in relation to organisational network typology iii. Energy cluster as a form of company network – common features and differences c) An attempt in characterisation and definition of an energy cluster.

Viability of Creating an Offshore Wind Energy Cluster: A Case Study

Considering the advantages associated with the port sector concerning the potential of offshore wind energy, several international ports are aiming to achieve a solid integration in offshore wind energy clusters. This article performs an analysis of several seaports and offshore wind energy clusters in Europe to assess the feasibility of implementing an offshore wind energy cluster in the Port of Aveiro, Portugal. A deep literature review and a case study methodology were performed. Based on the analysis of the offshore energy market, and of the value chain of the company case study (ASM Offshore), it was concluded that the Portuguese market in this sector is not competitive, compared with other international markets. Nevertheless, the development of an offshore wind energy cluster could increase the included companie’s prospects, as well as dispute the growth of other companies associated with this sector. This research is relevant, because there is a lack of research that links the importance of seaports in offshore wind energy projects, in particular with a cluster structure, and because it contributes to knowledge for the development of the Aveiro region and Portugal, based on the exploitation of the renewable energy market and to the increase of related activities.